diff --git a/calc.go b/calc.go
index 3d4a8be169b7dc81519aa7858ae783cb486c661f..61b6dac773fbbf584de42e183ce88e2bd26de123 100644
--- a/calc.go
+++ b/calc.go
@@ -644,6 +644,7 @@ func (fn *formulaFuncs) ABS(argsList *list.List) (result string, err error) {
 	}
 	var val float64
 	if val, err = strconv.ParseFloat(argsList.Front().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	result = fmt.Sprintf("%g", math.Abs(val))
@@ -663,6 +664,7 @@ func (fn *formulaFuncs) ACOS(argsList *list.List) (result string, err error) {
 	}
 	var val float64
 	if val, err = strconv.ParseFloat(argsList.Front().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	result = fmt.Sprintf("%g", math.Acos(val))
@@ -681,6 +683,7 @@ func (fn *formulaFuncs) ACOSH(argsList *list.List) (result string, err error) {
 	}
 	var val float64
 	if val, err = strconv.ParseFloat(argsList.Front().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	result = fmt.Sprintf("%g", math.Acosh(val))
@@ -700,6 +703,7 @@ func (fn *formulaFuncs) ACOT(argsList *list.List) (result string, err error) {
 	}
 	var val float64
 	if val, err = strconv.ParseFloat(argsList.Front().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	result = fmt.Sprintf("%g", math.Pi/2-math.Atan(val))
@@ -718,6 +722,7 @@ func (fn *formulaFuncs) ACOTH(argsList *list.List) (result string, err error) {
 	}
 	var val float64
 	if val, err = strconv.ParseFloat(argsList.Front().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	result = fmt.Sprintf("%g", math.Atanh(1/val))
@@ -774,6 +779,7 @@ func (fn *formulaFuncs) ASIN(argsList *list.List) (result string, err error) {
 	}
 	var val float64
 	if val, err = strconv.ParseFloat(argsList.Front().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	result = fmt.Sprintf("%g", math.Asin(val))
@@ -792,6 +798,7 @@ func (fn *formulaFuncs) ASINH(argsList *list.List) (result string, err error) {
 	}
 	var val float64
 	if val, err = strconv.ParseFloat(argsList.Front().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	result = fmt.Sprintf("%g", math.Asinh(val))
@@ -811,6 +818,7 @@ func (fn *formulaFuncs) ATAN(argsList *list.List) (result string, err error) {
 	}
 	var val float64
 	if val, err = strconv.ParseFloat(argsList.Front().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	result = fmt.Sprintf("%g", math.Atan(val))
@@ -829,6 +837,7 @@ func (fn *formulaFuncs) ATANH(argsList *list.List) (result string, err error) {
 	}
 	var val float64
 	if val, err = strconv.ParseFloat(argsList.Front().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	result = fmt.Sprintf("%g", math.Atanh(val))
@@ -848,34 +857,17 @@ func (fn *formulaFuncs) ATAN2(argsList *list.List) (result string, err error) {
 	}
 	var x, y float64
 	if x, err = strconv.ParseFloat(argsList.Back().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	if y, err = strconv.ParseFloat(argsList.Front().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	result = fmt.Sprintf("%g", math.Atan2(x, y))
 	return
 }
 
-// gcd returns the greatest common divisor of two supplied integers.
-func gcd(x, y float64) float64 {
-	x, y = math.Trunc(x), math.Trunc(y)
-	if x == 0 {
-		return y
-	}
-	if y == 0 {
-		return x
-	}
-	for x != y {
-		if x > y {
-			x = x - y
-		} else {
-			y = y - x
-		}
-	}
-	return x
-}
-
 // BASE function converts a number into a supplied base (radix), and returns a
 // text representation of the calculated value. The syntax of the function is:
 //
@@ -893,9 +885,11 @@ func (fn *formulaFuncs) BASE(argsList *list.List) (result string, err error) {
 	var number float64
 	var radix, minLength int
 	if number, err = strconv.ParseFloat(argsList.Front().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	if radix, err = strconv.Atoi(argsList.Front().Next().Value.(formulaArg).Value); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	if radix < 2 || radix > 36 {
@@ -904,6 +898,7 @@ func (fn *formulaFuncs) BASE(argsList *list.List) (result string, err error) {
 	}
 	if argsList.Len() > 2 {
 		if minLength, err = strconv.Atoi(argsList.Back().Value.(formulaArg).Value); err != nil {
+			err = errors.New(formulaErrorVALUE)
 			return
 		}
 	}
@@ -931,6 +926,7 @@ func (fn *formulaFuncs) CEILING(argsList *list.List) (result string, err error)
 	}
 	number, significance, res := 0.0, 1.0, 0.0
 	if number, err = strconv.ParseFloat(argsList.Front().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	if number < 0 {
@@ -938,6 +934,7 @@ func (fn *formulaFuncs) CEILING(argsList *list.List) (result string, err error)
 	}
 	if argsList.Len() > 1 {
 		if significance, err = strconv.ParseFloat(argsList.Back().Value.(formulaArg).Value, 64); err != nil {
+			err = errors.New(formulaErrorVALUE)
 			return
 		}
 	}
@@ -973,6 +970,7 @@ func (fn *formulaFuncs) CEILINGMATH(argsList *list.List) (result string, err err
 	}
 	number, significance, mode := 0.0, 1.0, 1.0
 	if number, err = strconv.ParseFloat(argsList.Front().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	if number < 0 {
@@ -980,6 +978,7 @@ func (fn *formulaFuncs) CEILINGMATH(argsList *list.List) (result string, err err
 	}
 	if argsList.Len() > 1 {
 		if significance, err = strconv.ParseFloat(argsList.Front().Next().Value.(formulaArg).Value, 64); err != nil {
+			err = errors.New(formulaErrorVALUE)
 			return
 		}
 	}
@@ -989,6 +988,7 @@ func (fn *formulaFuncs) CEILINGMATH(argsList *list.List) (result string, err err
 	}
 	if argsList.Len() > 2 {
 		if mode, err = strconv.ParseFloat(argsList.Back().Value.(formulaArg).Value, 64); err != nil {
+			err = errors.New(formulaErrorVALUE)
 			return
 		}
 	}
@@ -1021,6 +1021,7 @@ func (fn *formulaFuncs) CEILINGPRECISE(argsList *list.List) (result string, err
 	}
 	number, significance := 0.0, 1.0
 	if number, err = strconv.ParseFloat(argsList.Front().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	if number < 0 {
@@ -1032,6 +1033,7 @@ func (fn *formulaFuncs) CEILINGPRECISE(argsList *list.List) (result string, err
 	}
 	if argsList.Len() > 1 {
 		if significance, err = strconv.ParseFloat(argsList.Back().Value.(formulaArg).Value, 64); err != nil {
+			err = errors.New(formulaErrorVALUE)
 			return
 		}
 		significance = math.Abs(significance)
@@ -1062,9 +1064,11 @@ func (fn *formulaFuncs) COMBIN(argsList *list.List) (result string, err error) {
 	}
 	number, chosen, val := 0.0, 0.0, 1.0
 	if number, err = strconv.ParseFloat(argsList.Front().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	if chosen, err = strconv.ParseFloat(argsList.Back().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	number, chosen = math.Trunc(number), math.Trunc(chosen)
@@ -1095,9 +1099,11 @@ func (fn *formulaFuncs) COMBINA(argsList *list.List) (result string, err error)
 	}
 	var number, chosen float64
 	if number, err = strconv.ParseFloat(argsList.Front().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	if chosen, err = strconv.ParseFloat(argsList.Back().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	number, chosen = math.Trunc(number), math.Trunc(chosen)
@@ -1131,6 +1137,7 @@ func (fn *formulaFuncs) COS(argsList *list.List) (result string, err error) {
 	}
 	var val float64
 	if val, err = strconv.ParseFloat(argsList.Front().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	result = fmt.Sprintf("%g", math.Cos(val))
@@ -1149,6 +1156,7 @@ func (fn *formulaFuncs) COSH(argsList *list.List) (result string, err error) {
 	}
 	var val float64
 	if val, err = strconv.ParseFloat(argsList.Front().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	result = fmt.Sprintf("%g", math.Cosh(val))
@@ -1167,10 +1175,11 @@ func (fn *formulaFuncs) COT(argsList *list.List) (result string, err error) {
 	}
 	var val float64
 	if val, err = strconv.ParseFloat(argsList.Front().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	if val == 0 {
-		err = errors.New(formulaErrorNAME)
+		err = errors.New(formulaErrorDIV)
 		return
 	}
 	result = fmt.Sprintf("%g", math.Tan(val))
@@ -1189,10 +1198,11 @@ func (fn *formulaFuncs) COTH(argsList *list.List) (result string, err error) {
 	}
 	var val float64
 	if val, err = strconv.ParseFloat(argsList.Front().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	if val == 0 {
-		err = errors.New(formulaErrorNAME)
+		err = errors.New(formulaErrorDIV)
 		return
 	}
 	result = fmt.Sprintf("%g", math.Tanh(val))
@@ -1211,10 +1221,11 @@ func (fn *formulaFuncs) CSC(argsList *list.List) (result string, err error) {
 	}
 	var val float64
 	if val, err = strconv.ParseFloat(argsList.Front().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	if val == 0 {
-		err = errors.New(formulaErrorNAME)
+		err = errors.New(formulaErrorDIV)
 		return
 	}
 	result = fmt.Sprintf("%g", 1/math.Sin(val))
@@ -1233,10 +1244,11 @@ func (fn *formulaFuncs) CSCH(argsList *list.List) (result string, err error) {
 	}
 	var val float64
 	if val, err = strconv.ParseFloat(argsList.Front().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	if val == 0 {
-		err = errors.New(formulaErrorNAME)
+		err = errors.New(formulaErrorDIV)
 		return
 	}
 	result = fmt.Sprintf("%g", 1/math.Sinh(val))
@@ -1256,6 +1268,7 @@ func (fn *formulaFuncs) DECIMAL(argsList *list.List) (result string, err error)
 	var text = argsList.Front().Value.(formulaArg).Value
 	var radix int
 	if radix, err = strconv.Atoi(argsList.Back().Value.(formulaArg).Value); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	if len(text) > 2 && (strings.HasPrefix(text, "0x") || strings.HasPrefix(text, "0X")) {
@@ -1263,7 +1276,7 @@ func (fn *formulaFuncs) DECIMAL(argsList *list.List) (result string, err error)
 	}
 	val, err := strconv.ParseInt(text, radix, 64)
 	if err != nil {
-		err = errors.New(formulaErrorNUM)
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	result = fmt.Sprintf("%g", float64(val))
@@ -1282,10 +1295,11 @@ func (fn *formulaFuncs) DEGREES(argsList *list.List) (result string, err error)
 	}
 	var val float64
 	if val, err = strconv.ParseFloat(argsList.Front().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	if val == 0 {
-		err = errors.New(formulaErrorNAME)
+		err = errors.New(formulaErrorDIV)
 		return
 	}
 	result = fmt.Sprintf("%g", 180.0/math.Pi*val)
@@ -1305,6 +1319,7 @@ func (fn *formulaFuncs) EVEN(argsList *list.List) (result string, err error) {
 	}
 	var number float64
 	if number, err = strconv.ParseFloat(argsList.Front().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	sign := math.Signbit(number)
@@ -1333,6 +1348,7 @@ func (fn *formulaFuncs) EXP(argsList *list.List) (result string, err error) {
 	}
 	var number float64
 	if number, err = strconv.ParseFloat(argsList.Front().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	result = strings.ToUpper(fmt.Sprintf("%g", math.Exp(number)))
@@ -1360,6 +1376,7 @@ func (fn *formulaFuncs) FACT(argsList *list.List) (result string, err error) {
 	}
 	var number float64
 	if number, err = strconv.ParseFloat(argsList.Front().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	if number < 0 {
@@ -1381,10 +1398,12 @@ func (fn *formulaFuncs) FACTDOUBLE(argsList *list.List) (result string, err erro
 	}
 	number, val := 0.0, 1.0
 	if number, err = strconv.ParseFloat(argsList.Front().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	if number < 0 {
 		err = errors.New(formulaErrorNUM)
+		return
 	}
 	for i := math.Trunc(number); i > 1; i -= 2 {
 		val *= i
@@ -1405,13 +1424,16 @@ func (fn *formulaFuncs) FLOOR(argsList *list.List) (result string, err error) {
 	}
 	var number, significance float64
 	if number, err = strconv.ParseFloat(argsList.Front().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	if significance, err = strconv.ParseFloat(argsList.Back().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	if significance < 0 && number >= 0 {
 		err = errors.New(formulaErrorNUM)
+		return
 	}
 	val := number
 	val, res := math.Modf(val / significance)
@@ -1440,6 +1462,7 @@ func (fn *formulaFuncs) FLOORMATH(argsList *list.List) (result string, err error
 	}
 	number, significance, mode := 0.0, 1.0, 1.0
 	if number, err = strconv.ParseFloat(argsList.Front().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	if number < 0 {
@@ -1447,6 +1470,7 @@ func (fn *formulaFuncs) FLOORMATH(argsList *list.List) (result string, err error
 	}
 	if argsList.Len() > 1 {
 		if significance, err = strconv.ParseFloat(argsList.Front().Next().Value.(formulaArg).Value, 64); err != nil {
+			err = errors.New(formulaErrorVALUE)
 			return
 		}
 	}
@@ -1456,6 +1480,7 @@ func (fn *formulaFuncs) FLOORMATH(argsList *list.List) (result string, err error
 	}
 	if argsList.Len() > 2 {
 		if mode, err = strconv.ParseFloat(argsList.Back().Value.(formulaArg).Value, 64); err != nil {
+			err = errors.New(formulaErrorVALUE)
 			return
 		}
 	}
@@ -1483,6 +1508,7 @@ func (fn *formulaFuncs) FLOORPRECISE(argsList *list.List) (result string, err er
 	}
 	var number, significance float64
 	if number, err = strconv.ParseFloat(argsList.Front().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	if number < 0 {
@@ -1494,6 +1520,7 @@ func (fn *formulaFuncs) FLOORPRECISE(argsList *list.List) (result string, err er
 	}
 	if argsList.Len() > 1 {
 		if significance, err = strconv.ParseFloat(argsList.Back().Value.(formulaArg).Value, 64); err != nil {
+			err = errors.New(formulaErrorVALUE)
 			return
 		}
 		significance = math.Abs(significance)
@@ -1512,6 +1539,25 @@ func (fn *formulaFuncs) FLOORPRECISE(argsList *list.List) (result string, err er
 	return
 }
 
+// gcd returns the greatest common divisor of two supplied integers.
+func gcd(x, y float64) float64 {
+	x, y = math.Trunc(x), math.Trunc(y)
+	if x == 0 {
+		return y
+	}
+	if y == 0 {
+		return x
+	}
+	for x != y {
+		if x > y {
+			x = x - y
+		} else {
+			y = y - x
+		}
+	}
+	return x
+}
+
 // GCD function returns the greatest common divisor of two or more supplied
 // integers. The syntax of the function is:
 //
@@ -1532,6 +1578,7 @@ func (fn *formulaFuncs) GCD(argsList *list.List) (result string, err error) {
 			continue
 		}
 		if val, err = strconv.ParseFloat(token, 64); err != nil {
+			err = errors.New(formulaErrorVALUE)
 			return
 		}
 		nums = append(nums, val)
@@ -1568,6 +1615,7 @@ func (fn *formulaFuncs) INT(argsList *list.List) (result string, err error) {
 	}
 	var number float64
 	if number, err = strconv.ParseFloat(argsList.Front().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	val, frac := math.Modf(number)
@@ -1595,6 +1643,7 @@ func (fn *formulaFuncs) ISOCEILING(argsList *list.List) (result string, err erro
 	}
 	var number, significance float64
 	if number, err = strconv.ParseFloat(argsList.Front().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	if number < 0 {
@@ -1606,6 +1655,7 @@ func (fn *formulaFuncs) ISOCEILING(argsList *list.List) (result string, err erro
 	}
 	if argsList.Len() > 1 {
 		if significance, err = strconv.ParseFloat(argsList.Back().Value.(formulaArg).Value, 64); err != nil {
+			err = errors.New(formulaErrorVALUE)
 			return
 		}
 		significance = math.Abs(significance)
@@ -1654,6 +1704,7 @@ func (fn *formulaFuncs) LCM(argsList *list.List) (result string, err error) {
 			continue
 		}
 		if val, err = strconv.ParseFloat(token, 64); err != nil {
+			err = errors.New(formulaErrorVALUE)
 			return
 		}
 		nums = append(nums, val)
@@ -1690,6 +1741,7 @@ func (fn *formulaFuncs) LN(argsList *list.List) (result string, err error) {
 	}
 	var number float64
 	if number, err = strconv.ParseFloat(argsList.Front().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	result = fmt.Sprintf("%g", math.Log(number))
@@ -1712,10 +1764,12 @@ func (fn *formulaFuncs) LOG(argsList *list.List) (result string, err error) {
 	}
 	number, base := 0.0, 10.0
 	if number, err = strconv.ParseFloat(argsList.Front().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	if argsList.Len() > 1 {
 		if base, err = strconv.ParseFloat(argsList.Back().Value.(formulaArg).Value, 64); err != nil {
+			err = errors.New(formulaErrorVALUE)
 			return
 		}
 	}
@@ -1747,6 +1801,7 @@ func (fn *formulaFuncs) LOG10(argsList *list.List) (result string, err error) {
 	}
 	var number float64
 	if number, err = strconv.ParseFloat(argsList.Front().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	result = fmt.Sprintf("%g", math.Log10(number))
@@ -1835,9 +1890,11 @@ func (fn *formulaFuncs) MOD(argsList *list.List) (result string, err error) {
 	}
 	var number, divisor float64
 	if number, err = strconv.ParseFloat(argsList.Front().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	if divisor, err = strconv.ParseFloat(argsList.Back().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	if divisor == 0 {
@@ -1864,9 +1921,11 @@ func (fn *formulaFuncs) MROUND(argsList *list.List) (result string, err error) {
 	}
 	var number, multiple float64
 	if number, err = strconv.ParseFloat(argsList.Front().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	if multiple, err = strconv.ParseFloat(argsList.Back().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	if multiple == 0 {
@@ -1900,6 +1959,7 @@ func (fn *formulaFuncs) MULTINOMIAL(argsList *list.List) (result string, err err
 			continue
 		}
 		if val, err = strconv.ParseFloat(token.Value, 64); err != nil {
+			err = errors.New(formulaErrorVALUE)
 			return
 		}
 		num += val
@@ -1921,6 +1981,7 @@ func (fn *formulaFuncs) MUNIT(argsList *list.List) (result string, err error) {
 	}
 	var dimension int
 	if dimension, err = strconv.Atoi(argsList.Front().Value.(formulaArg).Value); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	matrix := make([][]float64, 0, dimension)
@@ -1951,6 +2012,7 @@ func (fn *formulaFuncs) ODD(argsList *list.List) (result string, err error) {
 	}
 	var number float64
 	if number, err = strconv.ParseFloat(argsList.Front().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	if number == 0 {
@@ -1997,9 +2059,11 @@ func (fn *formulaFuncs) POWER(argsList *list.List) (result string, err error) {
 	}
 	var x, y float64
 	if x, err = strconv.ParseFloat(argsList.Front().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	if y, err = strconv.ParseFloat(argsList.Back().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	if x == 0 && y == 0 {
@@ -2027,6 +2091,7 @@ func (fn *formulaFuncs) PRODUCT(argsList *list.List) (result string, err error)
 			continue
 		}
 		if val, err = strconv.ParseFloat(token.Value, 64); err != nil {
+			err = errors.New(formulaErrorVALUE)
 			return
 		}
 		product = product * val
@@ -2047,9 +2112,11 @@ func (fn *formulaFuncs) QUOTIENT(argsList *list.List) (result string, err error)
 	}
 	var x, y float64
 	if x, err = strconv.ParseFloat(argsList.Front().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	if y, err = strconv.ParseFloat(argsList.Back().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	if y == 0 {
@@ -2071,6 +2138,7 @@ func (fn *formulaFuncs) RADIANS(argsList *list.List) (result string, err error)
 	}
 	var angle float64
 	if angle, err = strconv.ParseFloat(argsList.Front().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	result = fmt.Sprintf("%g", math.Pi/180.0*angle)
@@ -2103,9 +2171,11 @@ func (fn *formulaFuncs) RANDBETWEEN(argsList *list.List) (result string, err err
 	}
 	var bottom, top int64
 	if bottom, err = strconv.ParseInt(argsList.Front().Value.(formulaArg).Value, 10, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	if top, err = strconv.ParseInt(argsList.Back().Value.(formulaArg).Value, 10, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	if top < bottom {
@@ -2148,10 +2218,12 @@ func (fn *formulaFuncs) ROMAN(argsList *list.List) (result string, err error) {
 	var number float64
 	var form int
 	if number, err = strconv.ParseFloat(argsList.Front().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	if argsList.Len() > 1 {
 		if form, err = strconv.Atoi(argsList.Back().Value.(formulaArg).Value); err != nil {
+			err = errors.New(formulaErrorVALUE)
 			return
 		}
 		if form < 0 {
@@ -2231,9 +2303,11 @@ func (fn *formulaFuncs) ROUND(argsList *list.List) (result string, err error) {
 	}
 	var number, digits float64
 	if number, err = strconv.ParseFloat(argsList.Front().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	if digits, err = strconv.ParseFloat(argsList.Back().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	result = fmt.Sprintf("%g", fn.round(number, digits, closest))
@@ -2252,9 +2326,11 @@ func (fn *formulaFuncs) ROUNDDOWN(argsList *list.List) (result string, err error
 	}
 	var number, digits float64
 	if number, err = strconv.ParseFloat(argsList.Front().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	if digits, err = strconv.ParseFloat(argsList.Back().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	result = fmt.Sprintf("%g", fn.round(number, digits, down))
@@ -2273,9 +2349,11 @@ func (fn *formulaFuncs) ROUNDUP(argsList *list.List) (result string, err error)
 	}
 	var number, digits float64
 	if number, err = strconv.ParseFloat(argsList.Front().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	if digits, err = strconv.ParseFloat(argsList.Back().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	result = fmt.Sprintf("%g", fn.round(number, digits, up))
@@ -2294,6 +2372,7 @@ func (fn *formulaFuncs) SEC(argsList *list.List) (result string, err error) {
 	}
 	var number float64
 	if number, err = strconv.ParseFloat(argsList.Front().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	result = fmt.Sprintf("%g", math.Cos(number))
@@ -2312,6 +2391,7 @@ func (fn *formulaFuncs) SECH(argsList *list.List) (result string, err error) {
 	}
 	var number float64
 	if number, err = strconv.ParseFloat(argsList.Front().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	result = fmt.Sprintf("%g", 1/math.Cosh(number))
@@ -2332,6 +2412,7 @@ func (fn *formulaFuncs) SIGN(argsList *list.List) (result string, err error) {
 	}
 	var val float64
 	if val, err = strconv.ParseFloat(argsList.Front().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	if val < 0 {
@@ -2358,6 +2439,7 @@ func (fn *formulaFuncs) SIN(argsList *list.List) (result string, err error) {
 	}
 	var number float64
 	if number, err = strconv.ParseFloat(argsList.Front().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	result = fmt.Sprintf("%g", math.Sin(number))
@@ -2376,6 +2458,7 @@ func (fn *formulaFuncs) SINH(argsList *list.List) (result string, err error) {
 	}
 	var number float64
 	if number, err = strconv.ParseFloat(argsList.Front().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	result = fmt.Sprintf("%g", math.Sinh(number))
@@ -2399,6 +2482,7 @@ func (fn *formulaFuncs) SQRT(argsList *list.List) (result string, err error) {
 		return
 	}
 	if res, err = strconv.ParseFloat(value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	if res < 0 {
@@ -2421,6 +2505,7 @@ func (fn *formulaFuncs) SQRTPI(argsList *list.List) (result string, err error) {
 	}
 	var number float64
 	if number, err = strconv.ParseFloat(argsList.Front().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	result = fmt.Sprintf("%g", math.Sqrt(number*math.Pi))
@@ -2440,6 +2525,7 @@ func (fn *formulaFuncs) SUM(argsList *list.List) (result string, err error) {
 			continue
 		}
 		if val, err = strconv.ParseFloat(token.Value, 64); err != nil {
+			err = errors.New(formulaErrorVALUE)
 			return
 		}
 		sum += val
@@ -2461,6 +2547,7 @@ func (fn *formulaFuncs) SUMSQ(argsList *list.List) (result string, err error) {
 			continue
 		}
 		if val, err = strconv.ParseFloat(token.Value, 64); err != nil {
+			err = errors.New(formulaErrorVALUE)
 			return
 		}
 		sq += val * val
@@ -2481,6 +2568,7 @@ func (fn *formulaFuncs) TAN(argsList *list.List) (result string, err error) {
 	}
 	var number float64
 	if number, err = strconv.ParseFloat(argsList.Front().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	result = fmt.Sprintf("%g", math.Tan(number))
@@ -2499,6 +2587,7 @@ func (fn *formulaFuncs) TANH(argsList *list.List) (result string, err error) {
 	}
 	var number float64
 	if number, err = strconv.ParseFloat(argsList.Front().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	result = fmt.Sprintf("%g", math.Tanh(number))
@@ -2517,10 +2606,12 @@ func (fn *formulaFuncs) TRUNC(argsList *list.List) (result string, err error) {
 	}
 	var number, digits, adjust, rtrim float64
 	if number, err = strconv.ParseFloat(argsList.Front().Value.(formulaArg).Value, 64); err != nil {
+		err = errors.New(formulaErrorVALUE)
 		return
 	}
 	if argsList.Len() > 1 {
 		if digits, err = strconv.ParseFloat(argsList.Back().Value.(formulaArg).Value, 64); err != nil {
+			err = errors.New(formulaErrorVALUE)
 			return
 		}
 		digits = math.Floor(digits)
diff --git a/calc_test.go b/calc_test.go
index fc107cb4221a4a13e5f89711705f19df84476f26..7592078c743cbbc8188c21466d1eec490c156ba3 100644
--- a/calc_test.go
+++ b/calc_test.go
@@ -77,13 +77,16 @@ func TestCalcCellValue(t *testing.T) {
 		"=CEILING(-22.25,-0.1)": "-22.3",
 		"=CEILING(-22.25,-1)":   "-23",
 		"=CEILING(-22.25,-5)":   "-25",
+		"=CEILING(22.25)":       "23",
 		// _xlfn.CEILING.MATH
-		"=_xlfn.CEILING.MATH(15.25,1)":    "16",
-		"=_xlfn.CEILING.MATH(15.25,0.1)":  "15.3",
-		"=_xlfn.CEILING.MATH(15.25,5)":    "20",
-		"=_xlfn.CEILING.MATH(-15.25,1)":   "-15",
-		"=_xlfn.CEILING.MATH(-15.25,1,1)": "-15", // should be 16
-		"=_xlfn.CEILING.MATH(-15.25,10)":  "-10",
+		"=_xlfn.CEILING.MATH(15.25,1)":      "16",
+		"=_xlfn.CEILING.MATH(15.25,0.1)":    "15.3",
+		"=_xlfn.CEILING.MATH(15.25,5)":      "20",
+		"=_xlfn.CEILING.MATH(-15.25,1)":     "-15",
+		"=_xlfn.CEILING.MATH(-15.25,1,1)":   "-15", // should be 16
+		"=_xlfn.CEILING.MATH(-15.25,10)":    "-10",
+		"=_xlfn.CEILING.MATH(-15.25)":       "-15",
+		"=_xlfn.CEILING.MATH(-15.25,-5,-1)": "-10",
 		// _xlfn.CEILING.PRECISE
 		"=_xlfn.CEILING.PRECISE(22.25,0.1)": "22.3",
 		"=_xlfn.CEILING.PRECISE(22.25,0.5)": "22.5",
@@ -101,6 +104,7 @@ func TestCalcCellValue(t *testing.T) {
 		"=COMBIN(6,4)": "15",
 		"=COMBIN(6,5)": "6",
 		"=COMBIN(6,6)": "1",
+		"=COMBIN(0,0)": "1",
 		// _xlfn.COMBINA
 		"=_xlfn.COMBINA(6,1)": "6",
 		"=_xlfn.COMBINA(6,2)": "21",
@@ -108,6 +112,7 @@ func TestCalcCellValue(t *testing.T) {
 		"=_xlfn.COMBINA(6,4)": "126",
 		"=_xlfn.COMBINA(6,5)": "252",
 		"=_xlfn.COMBINA(6,6)": "462",
+		"=_xlfn.COMBINA(0,0)": "0",
 		// COS
 		"=COS(0.785398163)": "0.707106781467586",
 		"=COS(0)":           "1",
@@ -125,10 +130,11 @@ func TestCalcCellValue(t *testing.T) {
 		// _xlfn.CSCH
 		"=_xlfn.CSCH(-3.14159265358979)": "-0.08658953753004724",
 		// _xlfn.DECIMAL
-		`=_xlfn.DECIMAL("1100",2)`:   "12",
-		`=_xlfn.DECIMAL("186A0",16)`: "100000",
-		`=_xlfn.DECIMAL("31L0",32)`:  "100000",
-		`=_xlfn.DECIMAL("70122",8)`:  "28754",
+		`=_xlfn.DECIMAL("1100",2)`:    "12",
+		`=_xlfn.DECIMAL("186A0",16)`:  "100000",
+		`=_xlfn.DECIMAL("31L0",32)`:   "100000",
+		`=_xlfn.DECIMAL("70122",8)`:   "28754",
+		`=_xlfn.DECIMAL("0x70122",8)`: "28754",
 		// DEGREES
 		"=DEGREES(1)":   "57.29577951308232",
 		"=DEGREES(2.5)": "143.2394487827058",
@@ -181,6 +187,9 @@ func TestCalcCellValue(t *testing.T) {
 		"=_xlfn.FLOOR.PRECISE(-26.75,-1)": "-27",
 		"=_xlfn.FLOOR.PRECISE(-26.75,-5)": "-30",
 		// GCD
+		"=GCD(0)":        "0",
+		`=GCD("",1)`:     "1",
+		"=GCD(1,0)":      "1",
 		"=GCD(1,5)":      "1",
 		"=GCD(15,10,25)": "5",
 		"=GCD(0,8,12)":   "4",
@@ -199,11 +208,15 @@ func TestCalcCellValue(t *testing.T) {
 		"=ISO.CEILING(-22.25,1)":   "-22",
 		"=ISO.CEILING(-22.25,0.1)": "-22.200000000000003",
 		"=ISO.CEILING(-22.25,5)":   "-20",
+		"=ISO.CEILING(-22.25,0)":   "0",
 		// LCM
 		"=LCM(1,5)":      "5",
 		"=LCM(15,10,25)": "150",
 		"=LCM(1,8,12)":   "24",
 		"=LCM(7,2)":      "14",
+		"=LCM(7)":        "7",
+		`=LCM("",1)`:     "1",
+		`=LCM(0,0)`:      "0",
 		// LN
 		"=LN(1)":   "0",
 		"=LN(100)": "4.605170185988092",
@@ -219,10 +232,11 @@ func TestCalcCellValue(t *testing.T) {
 		"=LOG10(0.001)": "-3",
 		"=LOG10(25)":    "1.3979400086720375",
 		// MOD
-		"=MOD(6,4)":     "2",
-		"=MOD(6,3)":     "0",
-		"=MOD(6,2.5)":   "1",
-		"=MOD(6,1.333)": "0.6680000000000001",
+		"=MOD(6,4)":      "2",
+		"=MOD(6,3)":      "0",
+		"=MOD(6,2.5)":    "1",
+		"=MOD(6,1.333)":  "0.6680000000000001",
+		"=MOD(-10.23,1)": "0.7699999999999996",
 		// MROUND
 		"=MROUND(333.7,0.5)":   "333.5",
 		"=MROUND(333.8,1)":     "334",
@@ -233,7 +247,8 @@ func TestCalcCellValue(t *testing.T) {
 		"=MROUND(-555.4,-1)":   "-555",
 		"=MROUND(-1555,-1000)": "-2000",
 		// MULTINOMIAL
-		"=MULTINOMIAL(3,1,2,5)": "27720",
+		"=MULTINOMIAL(3,1,2,5)":    "27720",
+		`=MULTINOMIAL("",3,1,2,5)`: "27720",
 		// _xlfn.MUNIT
 		"=_xlfn.MUNIT(4)": "", // not support currently
 		// ODD
@@ -249,7 +264,8 @@ func TestCalcCellValue(t *testing.T) {
 		// POWER
 		"=POWER(4,2)": "16",
 		// PRODUCT
-		"=PRODUCT(3,6)": "18",
+		"=PRODUCT(3,6)":    "18",
+		`=PRODUCT("",3,6)`: "18",
 		// QUOTIENT
 		"=QUOTIENT(5,2)":     "2",
 		"=QUOTIENT(4.5,3.1)": "1",
@@ -260,12 +276,14 @@ func TestCalcCellValue(t *testing.T) {
 		"=RADIANS(180)":  "3.141592653589793",
 		"=RADIANS(360)":  "6.283185307179586",
 		// ROMAN
-		"=ROMAN(499,0)":  "CDXCIX",
-		"=ROMAN(1999,0)": "MCMXCIX",
-		"=ROMAN(1999,1)": "MLMVLIV",
-		"=ROMAN(1999,2)": "MXMIX",
-		"=ROMAN(1999,3)": "MVMIV",
-		"=ROMAN(1999,4)": "MIM",
+		"=ROMAN(499,0)":   "CDXCIX",
+		"=ROMAN(1999,0)":  "MCMXCIX",
+		"=ROMAN(1999,1)":  "MLMVLIV",
+		"=ROMAN(1999,2)":  "MXMIX",
+		"=ROMAN(1999,3)":  "MVMIV",
+		"=ROMAN(1999,4)":  "MIM",
+		"=ROMAN(1999,-1)": "MCMXCIX",
+		"=ROMAN(1999,5)":  "MIM",
 		// ROUND
 		"=ROUND(100.319,1)": "100.30000000000001",
 		"=ROUND(5.28,1)":    "5.300000000000001",
@@ -317,6 +335,7 @@ func TestCalcCellValue(t *testing.T) {
 		"=SQRTPI(0)":   "0",
 		// SUM
 		"=SUM(1,2)":                           "3",
+		`=SUM("",1,2)`:                        "3",
 		"=SUM(1,2+3)":                         "6",
 		"=SUM(SUM(1,2),2)":                    "5",
 		"=(-2-SUM(-4+7))*5":                   "-25",
@@ -330,8 +349,9 @@ func TestCalcCellValue(t *testing.T) {
 		"=1+SUM(SUM(1,2*3),4)*-4/2+5+(4+2)*3": "2",
 		"=1+SUM(SUM(1,2*3),4)*4/3+5+(4+2)*3":  "38.666666666666664",
 		// SUMSQ
-		"=SUMSQ(A1:A4)":         "14",
-		"=SUMSQ(A1,B1,A2,B2,6)": "82",
+		"=SUMSQ(A1:A4)":            "14",
+		"=SUMSQ(A1,B1,A2,B2,6)":    "82",
+		`=SUMSQ("",A1,B1,A2,B2,6)`: "82",
 		// TAN
 		"=TAN(1.047197551)": "1.732050806782486",
 		"=TAN(0)":           "0",
@@ -356,173 +376,269 @@ func TestCalcCellValue(t *testing.T) {
 	}
 	mathCalcError := map[string]string{
 		// ABS
-		"=ABS()":  "ABS requires 1 numeric argument",
-		"=ABS(~)": `cannot convert cell "~" to coordinates: invalid cell name "~"`,
+		"=ABS()":    "ABS requires 1 numeric argument",
+		`=ABS("X")`: "#VALUE!",
+		"=ABS(~)":   `cannot convert cell "~" to coordinates: invalid cell name "~"`,
 		// ACOS
-		"=ACOS()": "ACOS requires 1 numeric argument",
+		"=ACOS()":    "ACOS requires 1 numeric argument",
+		`=ACOS("X")`: "#VALUE!",
 		// ACOSH
-		"=ACOSH()": "ACOSH requires 1 numeric argument",
+		"=ACOSH()":    "ACOSH requires 1 numeric argument",
+		`=ACOSH("X")`: "#VALUE!",
 		// _xlfn.ACOT
-		"=_xlfn.ACOT()": "ACOT requires 1 numeric argument",
+		"=_xlfn.ACOT()":    "ACOT requires 1 numeric argument",
+		`=_xlfn.ACOT("X")`: "#VALUE!",
 		// _xlfn.ACOTH
-		"=_xlfn.ACOTH()": "ACOTH requires 1 numeric argument",
+		"=_xlfn.ACOTH()":    "ACOTH requires 1 numeric argument",
+		`=_xlfn.ACOTH("X")`: "#VALUE!",
 		// _xlfn.ARABIC
 		"=_xlfn.ARABIC()": "ARABIC requires 1 numeric argument",
 		// ASIN
-		"=ASIN()": "ASIN requires 1 numeric argument",
+		"=ASIN()":    "ASIN requires 1 numeric argument",
+		`=ASIN("X")`: "#VALUE!",
 		// ASINH
-		"=ASINH()": "ASINH requires 1 numeric argument",
+		"=ASINH()":    "ASINH requires 1 numeric argument",
+		`=ASINH("X")`: "#VALUE!",
 		// ATAN
-		"=ATAN()": "ATAN requires 1 numeric argument",
+		"=ATAN()":    "ATAN requires 1 numeric argument",
+		`=ATAN("X")`: "#VALUE!",
 		// ATANH
-		"=ATANH()": "ATANH requires 1 numeric argument",
+		"=ATANH()":    "ATANH requires 1 numeric argument",
+		`=ATANH("X")`: "#VALUE!",
 		// ATAN2
-		"=ATAN2()": "ATAN2 requires 2 numeric arguments",
+		"=ATAN2()":      "ATAN2 requires 2 numeric arguments",
+		`=ATAN2("X",0)`: "#VALUE!",
+		`=ATAN2(0,"X")`: "#VALUE!",
 		// BASE
 		"=BASE()":        "BASE requires at least 2 arguments",
 		"=BASE(1,2,3,4)": "BASE allows at most 3 arguments",
 		"=BASE(1,1)":     "radix must be an integer >= 2 and <= 36",
+		`=BASE("X",2)`:   "#VALUE!",
+		`=BASE(1,"X")`:   "#VALUE!",
+		`=BASE(1,2,"X")`: "#VALUE!",
 		// CEILING
 		"=CEILING()":      "CEILING requires at least 1 argument",
 		"=CEILING(1,2,3)": "CEILING allows at most 2 arguments",
 		"=CEILING(1,-1)":  "negative sig to CEILING invalid",
+		`=CEILING("X",0)`: "#VALUE!",
+		`=CEILING(0,"X")`: "#VALUE!",
 		// _xlfn.CEILING.MATH
 		"=_xlfn.CEILING.MATH()":        "CEILING.MATH requires at least 1 argument",
 		"=_xlfn.CEILING.MATH(1,2,3,4)": "CEILING.MATH allows at most 3 arguments",
+		`=_xlfn.CEILING.MATH("X")`:     "#VALUE!",
+		`=_xlfn.CEILING.MATH(1,"X")`:   "#VALUE!",
+		`=_xlfn.CEILING.MATH(1,2,"X")`: "#VALUE!",
 		// _xlfn.CEILING.PRECISE
 		"=_xlfn.CEILING.PRECISE()":      "CEILING.PRECISE requires at least 1 argument",
 		"=_xlfn.CEILING.PRECISE(1,2,3)": "CEILING.PRECISE allows at most 2 arguments",
+		`=_xlfn.CEILING.PRECISE("X",2)`: "#VALUE!",
+		`=_xlfn.CEILING.PRECISE(1,"X")`: "#VALUE!",
 		// COMBIN
-		"=COMBIN()":     "COMBIN requires 2 argument",
-		"=COMBIN(-1,1)": "COMBIN requires number >= number_chosen",
+		"=COMBIN()":       "COMBIN requires 2 argument",
+		"=COMBIN(-1,1)":   "COMBIN requires number >= number_chosen",
+		`=COMBIN("X",1)`:  "#VALUE!",
+		`=COMBIN(-1,"X")`: "#VALUE!",
 		// _xlfn.COMBINA
-		"=_xlfn.COMBINA()":      "COMBINA requires 2 argument",
-		"=_xlfn.COMBINA(-1,1)":  "COMBINA requires number > number_chosen",
-		"=_xlfn.COMBINA(-1,-1)": "COMBIN requires number >= number_chosen",
+		"=_xlfn.COMBINA()":       "COMBINA requires 2 argument",
+		"=_xlfn.COMBINA(-1,1)":   "COMBINA requires number > number_chosen",
+		"=_xlfn.COMBINA(-1,-1)":  "COMBIN requires number >= number_chosen",
+		`=_xlfn.COMBINA("X",1)`:  "#VALUE!",
+		`=_xlfn.COMBINA(-1,"X")`: "#VALUE!",
 		// COS
-		"=COS()": "COS requires 1 numeric argument",
+		"=COS()":    "COS requires 1 numeric argument",
+		`=COS("X")`: "#VALUE!",
 		// COSH
-		"=COSH()": "COSH requires 1 numeric argument",
+		"=COSH()":    "COSH requires 1 numeric argument",
+		`=COSH("X")`: "#VALUE!",
 		// _xlfn.COT
-		"=COT()": "COT requires 1 numeric argument",
+		"=COT()":    "COT requires 1 numeric argument",
+		`=COT("X")`: "#VALUE!",
+		"=COT(0)":   "#DIV/0!",
 		// _xlfn.COTH
-		"=COTH()": "COTH requires 1 numeric argument",
+		"=COTH()":    "COTH requires 1 numeric argument",
+		`=COTH("X")`: "#VALUE!",
+		"=COTH(0)":   "#DIV/0!",
 		// _xlfn.CSC
-		"=_xlfn.CSC()":  "CSC requires 1 numeric argument",
-		"=_xlfn.CSC(0)": "#NAME?",
+		"=_xlfn.CSC()":    "CSC requires 1 numeric argument",
+		`=_xlfn.CSC("X")`: "#VALUE!",
+		"=_xlfn.CSC(0)":   "#DIV/0!",
 		// _xlfn.CSCH
-		"=_xlfn.CSCH()":  "CSCH requires 1 numeric argument",
-		"=_xlfn.CSCH(0)": "#NAME?",
+		"=_xlfn.CSCH()":    "CSCH requires 1 numeric argument",
+		`=_xlfn.CSCH("X")`: "#VALUE!",
+		"=_xlfn.CSCH(0)":   "#DIV/0!",
 		// _xlfn.DECIMAL
 		"=_xlfn.DECIMAL()":          "DECIMAL requires 2 numeric arguments",
-		`=_xlfn.DECIMAL("2000", 2)`: "#NUM!",
+		`=_xlfn.DECIMAL("X", 2)`:    "#VALUE!",
+		`=_xlfn.DECIMAL(2000, "X")`: "#VALUE!",
 		// DEGREES
-		"=DEGREES()": "DEGREES requires 1 numeric argument",
+		"=DEGREES()":    "DEGREES requires 1 numeric argument",
+		`=DEGREES("X")`: "#VALUE!",
+		"=DEGREES(0)":   "#DIV/0!",
 		// EVEN
-		"=EVEN()": "EVEN requires 1 numeric argument",
+		"=EVEN()":    "EVEN requires 1 numeric argument",
+		`=EVEN("X")`: "#VALUE!",
 		// EXP
-		"=EXP()": "EXP requires 1 numeric argument",
+		"=EXP()":    "EXP requires 1 numeric argument",
+		`=EXP("X")`: "#VALUE!",
 		// FACT
-		"=FACT()":   "FACT requires 1 numeric argument",
-		"=FACT(-1)": "#NUM!",
+		"=FACT()":    "FACT requires 1 numeric argument",
+		`=FACT("X")`: "#VALUE!",
+		"=FACT(-1)":  "#NUM!",
 		// FACTDOUBLE
-		"=FACTDOUBLE()":   "FACTDOUBLE requires 1 numeric argument",
-		"=FACTDOUBLE(-1)": "#NUM!",
+		"=FACTDOUBLE()":    "FACTDOUBLE requires 1 numeric argument",
+		`=FACTDOUBLE("X")`: "#VALUE!",
+		"=FACTDOUBLE(-1)":  "#NUM!",
 		// FLOOR
-		"=FLOOR()":     "FLOOR requires 2 numeric arguments",
-		"=FLOOR(1,-1)": "#NUM!",
+		"=FLOOR()":       "FLOOR requires 2 numeric arguments",
+		`=FLOOR("X",-1)`: "#VALUE!",
+		`=FLOOR(1,"X")`:  "#VALUE!",
+		"=FLOOR(1,-1)":   "#NUM!",
 		// _xlfn.FLOOR.MATH
 		"=_xlfn.FLOOR.MATH()":        "FLOOR.MATH requires at least 1 argument",
 		"=_xlfn.FLOOR.MATH(1,2,3,4)": "FLOOR.MATH allows at most 3 arguments",
+		`=_xlfn.FLOOR.MATH("X",2,3)`: "#VALUE!",
+		`=_xlfn.FLOOR.MATH(1,"X",3)`: "#VALUE!",
+		`=_xlfn.FLOOR.MATH(1,2,"X")`: "#VALUE!",
 		// _xlfn.FLOOR.PRECISE
 		"=_xlfn.FLOOR.PRECISE()":      "FLOOR.PRECISE requires at least 1 argument",
 		"=_xlfn.FLOOR.PRECISE(1,2,3)": "FLOOR.PRECISE allows at most 2 arguments",
+		`=_xlfn.FLOOR.PRECISE("X",2)`: "#VALUE!",
+		`=_xlfn.FLOOR.PRECISE(1,"X")`: "#VALUE!",
 		// GCD
 		"=GCD()":     "GCD requires at least 1 argument",
 		"=GCD(-1)":   "GCD only accepts positive arguments",
 		"=GCD(1,-1)": "GCD only accepts positive arguments",
+		`=GCD("X")`:  "#VALUE!",
 		// INT
-		"=INT()": "INT requires 1 numeric argument",
+		"=INT()":    "INT requires 1 numeric argument",
+		`=INT("X")`: "#VALUE!",
 		// ISO.CEILING
 		"=ISO.CEILING()":      "ISO.CEILING requires at least 1 argument",
 		"=ISO.CEILING(1,2,3)": "ISO.CEILING allows at most 2 arguments",
+		`=ISO.CEILING("X",2)`: "#VALUE!",
+		`=ISO.CEILING(1,"X")`: "#VALUE!",
 		// LCM
 		"=LCM()":     "LCM requires at least 1 argument",
 		"=LCM(-1)":   "LCM only accepts positive arguments",
 		"=LCM(1,-1)": "LCM only accepts positive arguments",
+		`=LCM("X")`:  "#VALUE!",
 		// LN
-		"=LN()": "LN requires 1 numeric argument",
+		"=LN()":    "LN requires 1 numeric argument",
+		`=LN("X")`: "#VALUE!",
 		// LOG
 		"=LOG()":      "LOG requires at least 1 argument",
 		"=LOG(1,2,3)": "LOG allows at most 2 arguments",
+		`=LOG("X",1)`: "#VALUE!",
+		`=LOG(1,"X")`: "#VALUE!",
 		"=LOG(0,0)":   "#NUM!",
 		"=LOG(1,0)":   "#NUM!",
 		"=LOG(1,1)":   "#DIV/0!",
 		// LOG10
-		"=LOG10()": "LOG10 requires 1 numeric argument",
+		"=LOG10()":    "LOG10 requires 1 numeric argument",
+		`=LOG10("X")`: "#VALUE!",
 		// MOD
-		"=MOD()":    "MOD requires 2 numeric arguments",
-		"=MOD(6,0)": "#DIV/0!",
+		"=MOD()":      "MOD requires 2 numeric arguments",
+		"=MOD(6,0)":   "#DIV/0!",
+		`=MOD("X",0)`: "#VALUE!",
+		`=MOD(6,"X")`: "#VALUE!",
 		// MROUND
-		"=MROUND()":    "MROUND requires 2 numeric arguments",
-		"=MROUND(1,0)": "#NUM!",
+		"=MROUND()":      "MROUND requires 2 numeric arguments",
+		"=MROUND(1,0)":   "#NUM!",
+		"=MROUND(1,-1)":  "#NUM!",
+		`=MROUND("X",0)`: "#VALUE!",
+		`=MROUND(1,"X")`: "#VALUE!",
+		// MULTINOMIAL
+		`=MULTINOMIAL("X")`: "#VALUE!",
 		// _xlfn.MUNIT
-		"=_xlfn.MUNIT()": "MUNIT requires 1 numeric argument", // not support currently
+		"=_xlfn.MUNIT()":    "MUNIT requires 1 numeric argument", // not support currently
+		`=_xlfn.MUNIT("X")`: "#VALUE!",                           // not support currently
 		// ODD
-		"=ODD()": "ODD requires 1 numeric argument",
+		"=ODD()":    "ODD requires 1 numeric argument",
+		`=ODD("X")`: "#VALUE!",
 		// PI
 		"=PI(1)": "PI accepts no arguments",
 		// POWER
-		"=POWER(0,0)":  "#NUM!",
-		"=POWER(0,-1)": "#DIV/0!",
-		"=POWER(1)":    "POWER requires 2 numeric arguments",
+		`=POWER("X",1)`: "#VALUE!",
+		`=POWER(1,"X")`: "#VALUE!",
+		"=POWER(0,0)":   "#NUM!",
+		"=POWER(0,-1)":  "#DIV/0!",
+		"=POWER(1)":     "POWER requires 2 numeric arguments",
+		// PRODUCT
+		`=PRODUCT("X")`: "#VALUE!",
 		// QUOTIENT
-		"=QUOTIENT(1,0)": "#DIV/0!",
-		"=QUOTIENT(1)":   "QUOTIENT requires 2 numeric arguments",
+		`=QUOTIENT("X",1)`: "#VALUE!",
+		`=QUOTIENT(1,"X")`: "#VALUE!",
+		"=QUOTIENT(1,0)":   "#DIV/0!",
+		"=QUOTIENT(1)":     "QUOTIENT requires 2 numeric arguments",
 		// RADIANS
-		"=RADIANS()": "RADIANS requires 1 numeric argument",
+		`=RADIANS("X")`: "#VALUE!",
+		"=RADIANS()":    "RADIANS requires 1 numeric argument",
 		// RAND
 		"=RAND(1)": "RAND accepts no arguments",
 		// RANDBETWEEN
-		"=RANDBETWEEN()":    "RANDBETWEEN requires 2 numeric arguments",
-		"=RANDBETWEEN(2,1)": "#NUM!",
+		`=RANDBETWEEN("X",1)`: "#VALUE!",
+		`=RANDBETWEEN(1,"X")`: "#VALUE!",
+		"=RANDBETWEEN()":      "RANDBETWEEN requires 2 numeric arguments",
+		"=RANDBETWEEN(2,1)":   "#NUM!",
 		// ROMAN
 		"=ROMAN()":      "ROMAN requires at least 1 argument",
 		"=ROMAN(1,2,3)": "ROMAN allows at most 2 arguments",
+		`=ROMAN("X")`:   "#VALUE!",
+		`=ROMAN("X",1)`: "#VALUE!",
 		// ROUND
-		"=ROUND()": "ROUND requires 2 numeric arguments",
+		"=ROUND()":      "ROUND requires 2 numeric arguments",
+		`=ROUND("X",1)`: "#VALUE!",
+		`=ROUND(1,"X")`: "#VALUE!",
 		// ROUNDDOWN
-		"=ROUNDDOWN()": "ROUNDDOWN requires 2 numeric arguments",
+		"=ROUNDDOWN()":      "ROUNDDOWN requires 2 numeric arguments",
+		`=ROUNDDOWN("X",1)`: "#VALUE!",
+		`=ROUNDDOWN(1,"X")`: "#VALUE!",
 		// ROUNDUP
-		"=ROUNDUP()": "ROUNDUP requires 2 numeric arguments",
+		"=ROUNDUP()":      "ROUNDUP requires 2 numeric arguments",
+		`=ROUNDUP("X",1)`: "#VALUE!",
+		`=ROUNDUP(1,"X")`: "#VALUE!",
 		// SEC
-		"=_xlfn.SEC()": "SEC requires 1 numeric argument",
+		"=_xlfn.SEC()":    "SEC requires 1 numeric argument",
+		`=_xlfn.SEC("X")`: "#VALUE!",
 		// _xlfn.SECH
-		"=_xlfn.SECH()": "SECH requires 1 numeric argument",
+		"=_xlfn.SECH()":    "SECH requires 1 numeric argument",
+		`=_xlfn.SECH("X")`: "#VALUE!",
 		// SIGN
-		"=SIGN()": "SIGN requires 1 numeric argument",
+		"=SIGN()":    "SIGN requires 1 numeric argument",
+		`=SIGN("X")`: "#VALUE!",
 		// SIN
-		"=SIN()": "SIN requires 1 numeric argument",
+		"=SIN()":    "SIN requires 1 numeric argument",
+		`=SIN("X")`: "#VALUE!",
 		// SINH
-		"=SINH()": "SINH requires 1 numeric argument",
+		"=SINH()":    "SINH requires 1 numeric argument",
+		`=SINH("X")`: "#VALUE!",
 		// SQRT
-		"=SQRT()":   "SQRT requires 1 numeric argument",
-		"=SQRT(-1)": "#NUM!",
+		"=SQRT()":    "SQRT requires 1 numeric argument",
+		`=SQRT("X")`: "#VALUE!",
+		"=SQRT(-1)":  "#NUM!",
 		// SQRTPI
-		"=SQRTPI()": "SQRTPI requires 1 numeric argument",
+		"=SQRTPI()":    "SQRTPI requires 1 numeric argument",
+		`=SQRTPI("X")`: "#VALUE!",
 		// SUM
-		"=SUM((":   "formula not valid",
-		"=SUM(-)":  "formula not valid",
-		"=SUM(1+)": "formula not valid",
-		"=SUM(1-)": "formula not valid",
-		"=SUM(1*)": "formula not valid",
-		"=SUM(1/)": "formula not valid",
+		"=SUM((":    "formula not valid",
+		"=SUM(-)":   "formula not valid",
+		"=SUM(1+)":  "formula not valid",
+		"=SUM(1-)":  "formula not valid",
+		"=SUM(1*)":  "formula not valid",
+		"=SUM(1/)":  "formula not valid",
+		`=SUM("X")`: "#VALUE!",
+		// SUMSQ
+		`=SUMSQ("X")`: "#VALUE!",
 		// TAN
-		"=TAN()": "TAN requires 1 numeric argument",
+		"=TAN()":    "TAN requires 1 numeric argument",
+		`=TAN("X")`: "#VALUE!",
 		// TANH
-		"=TANH()": "TANH requires 1 numeric argument",
+		"=TANH()":    "TANH requires 1 numeric argument",
+		`=TANH("X")`: "#VALUE!",
 		// TRUNC
-		"=TRUNC()": "TRUNC requires at least 1 argument",
+		"=TRUNC()":      "TRUNC requires at least 1 argument",
+		`=TRUNC("X")`:   "#VALUE!",
+		`=TRUNC(1,"X")`: "#VALUE!",
 	}
 	for formula, expected := range mathCalcError {
 		f := prepareData()
@@ -570,6 +686,17 @@ func TestCalcCellValue(t *testing.T) {
 		assert.Equal(t, "", result, formula)
 	}
 
+	volatileFuncs := []string{
+		"=RAND()",
+		"=RANDBETWEEN(1,2)",
+	}
+	for _, formula := range volatileFuncs {
+		f := prepareData()
+		assert.NoError(t, f.SetCellFormula("Sheet1", "C1", formula))
+		_, err := f.CalcCellValue("Sheet1", "C1")
+		assert.NoError(t, err)
+	}
+
 	// Test get calculated cell value on not formula cell.
 	f := prepareData()
 	result, err := f.CalcCellValue("Sheet1", "A1")
diff --git a/go.mod b/go.mod
index e411f19543d4aefe98cb3d1d4f49559ff359805f..f94f33beb248c52801aacfe8304d60672e124922 100644
--- a/go.mod
+++ b/go.mod
@@ -4,10 +4,14 @@ go 1.12
 
 require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/kr/text v0.2.0 // indirect
 	github.com/mohae/deepcopy v0.0.0-20170929034955-c48cc78d4826
-	github.com/stretchr/testify v1.3.0
+	github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e // indirect
+	github.com/stretchr/testify v1.5.1
 	github.com/xuri/efp v0.0.0-20191019043341-b7dc4fe9aa91
-	golang.org/x/image v0.0.0-20190910094157-69e4b8554b2a
-	golang.org/x/net v0.0.0-20191209160850-c0dbc17a3553
+	golang.org/x/image v0.0.0-20200430140353-33d19683fad8
+	golang.org/x/net v0.0.0-20200506145744-7e3656a0809f
 	golang.org/x/text v0.3.2 // indirect
+	gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f // indirect
+	gopkg.in/yaml.v2 v2.2.8 // indirect
 )
diff --git a/go.sum b/go.sum
index ff969f082b32a930266a3d87907a1615ed2ec7df..7fa49fe5013be50a0185a8bcad8e7e2ad4f9aefe 100644
--- a/go.sum
+++ b/go.sum
@@ -1,24 +1,39 @@
-github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
+github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
+github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
+github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
+github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
+github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
 github.com/mohae/deepcopy v0.0.0-20170929034955-c48cc78d4826 h1:RWengNIwukTxcDr9M+97sNutRR1RKhG96O6jWumTTnw=
 github.com/mohae/deepcopy v0.0.0-20170929034955-c48cc78d4826/go.mod h1:TaXosZuwdSHYgviHp1DAtfrULt5eUgsSMsZf+YrPgl8=
+github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e h1:fD57ERR4JtEqsWbfPhv4DMiApHyliiK5xCTNVSPiaAs=
+github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e/go.mod h1:zD1mROLANZcx1PVRCS0qkT7pwLkGfwJo4zjcN/Tysno=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
-github.com/stretchr/testify v1.3.0 h1:TivCn/peBQ7UY8ooIcPgZFpTNSz0Q2U6UrFlUfqbe0Q=
-github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
+github.com/stretchr/testify v1.5.1 h1:nOGnQDM7FYENwehXlg/kFVnos3rEvtKTjRvOWSzb6H4=
+github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
 github.com/xuri/efp v0.0.0-20191019043341-b7dc4fe9aa91 h1:gp02YctZuIPTk0t7qI+wvg3VQwTPyNmSGG6ZqOsjSL8=
 github.com/xuri/efp v0.0.0-20191019043341-b7dc4fe9aa91/go.mod h1:uBiSUepVYMhGTfDeBKKasV4GpgBlzJ46gXUBAqV8qLk=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
-golang.org/x/image v0.0.0-20190910094157-69e4b8554b2a h1:gHevYm0pO4QUbwy8Dmdr01R5r1BuKtfYqRqF0h/Cbh0=
-golang.org/x/image v0.0.0-20190910094157-69e4b8554b2a/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0=
-golang.org/x/net v0.0.0-20191209160850-c0dbc17a3553 h1:efeOvDhwQ29Dj3SdAV/MJf8oukgn+8D8WgaCaRMchF8=
-golang.org/x/net v0.0.0-20191209160850-c0dbc17a3553/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/image v0.0.0-20200430140353-33d19683fad8 h1:6WW6V3x1P/jokJBpRQYUJnMHRP6isStQwCozxnU7XQw=
+golang.org/x/image v0.0.0-20200430140353-33d19683fad8/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0=
+golang.org/x/net v0.0.0-20200506145744-7e3656a0809f h1:QBjCr1Fz5kw158VqdE9JfI9cJnl/ymnJWAdMuinqL7Y=
+golang.org/x/net v0.0.0-20200506145744-7e3656a0809f/go.mod h1:qpuaurCH72eLCgpAm/N6yyVIVM9cpaDIP3A8BGJEC5A=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
-golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
+golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.2 h1:tW2bmiBqwgJj/UpqtC8EpXEZVYOwU0yG4iWbprSVAcs=
 golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
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